[Coco] Writing a virtual GPU / FPU device.

[Bill Pierce]

This is a file I got from somewhere a few years ago. It has since been updated but not recently. All of the newer devices need to be added like CocoSDC, Mega MultiPak, GameMaster etc.
If you update it, send me a copy so I can update mine.
The document is in MS Word "doc" format which can be read by many open source readers and editors.
 
http://yaccs.info/BPIERCECOCO/Stuff/Coco_Registered_Port_Addresses_and_Devices.doc

B.Pierce
 
 
-----Original Message-----
From: Walter Zambotti <zambotti at iinet.net.au>
To: 'CoCoList for Color Computer Enthusiasts' <coco at maltedmedia.com>
Sent: Thu, May 23, 2019 12:32 am
Subject: [Coco] Writing a virtual GPU / FPU device.

I kind of have exposure to virtual devices via the OVCC project that allowed
me to investigate how the dynanmic device modules are designed.

 

Now I would like to create my own GPU / FPU device.

 

I would like to know how device designers chose the memory addresses to
where the device maps its registers.

 

Of course I don't want to conflict with any other devices!

 

Is there a list of memory addresses used by all other devices?

 

The Tandy CoCo Service manual provides all the standard device mappings but
what about third party?

 

Walter


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